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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
LOL
As far as my understanding goes if you go with a minus symbol it starts from the index of the last character and cuts as many characters as you need, -1 cuts the last, -2 cuts the last two and -3 cuts the last three characters just like with positive numbers but in a reversed manner.